If a plane electromagnetic wave satisfies the equation $${{{\partial ^2}\,{E_x}} \over {\partial \,{z^2}}} = \,{c^2}{{{\partial ^2}\,{E_x}} \over {\partial \,{t^2}}},$$ the wave propagates in the

A TEM wave is incident normally upon a perfect conductor. The E and H fields at the boundary will be respectively

The depth of penetration of a wave in a lossy dielectric increases with increasing

The intrinsic impedance of copper at high frequencies is